WEED CONTROL Herbicide Residue Basis (rimsulfuron + thifensulfuron) may have a residue the year following application to corn. The residue is from rimsulfuron. Thifensulfuron will not have any residue the following year. Rotational crop restrictions for Basis are found on page 64 of the 1996 North Dakota Weed Control Guide in the table, "Rotation Restrictions for Crops Grown in North Dakota". All other rotational crops may be seeded 18 months or more after Basis application.